A hospital is a building where patients are diagnosed, treated and cared for around the clock. From a mechanical point of view it is one of the most demanding buildings there is: air, water and piped gases are part of patient care, the building never closes, and many systems must keep running even when part of the plant fails.
A hospital mixes very different spaces under one roof: patient rooms, operating rooms, emergency and imaging departments, labs, pharmacies, kitchens, laundry and a central plant. Each has its own requirements for airflow, pressure, temperature, humidity and plumbing.
Ventilation in a hospital controls infection as well as comfort. Isolation rooms are kept at negative pressure so contaminated air stays inside; operating rooms and protective rooms are kept positive so outside air stays out. Air change rates and filtration follow healthcare ventilation standards.
Oxygen, medical air, nitrous oxide, nitrogen and vacuum are piped from a central source to patient rooms and surgery. These systems are installed by specially qualified installers and tested and certified before they serve patients.
Chillers, boilers, pumps and air handlers are usually backed up, and critical systems tie into emergency power. Domestic hot water is held at controlled temperatures and recirculated under a water management plan to limit Legionella risk in a building full of vulnerable people.
Mechanical contractors deliver HVAC, plumbing, medical gas and the central plant, often while the rest of the hospital stays open. That work calls for pipefitters and plumbers with medical gas qualifications, HVAC service technicians, controls technicians, and project managers and superintendents who know infection-control procedures for working in occupied healthcare buildings.
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